Segment and Revenue Information - Schedule of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Segment revenue	$ 158,444	$ 110,128	$ 87,265
United States and Canada
Segment Reporting Information [Line Items]
Segment revenue	139,443	91,205	68,607
Asia
Segment Reporting Information [Line Items]
Segment revenue	11,836	9,397	11,637
Europe
Segment Reporting Information [Line Items]
Segment revenue	4,802	5,559	6,209
Other
Segment Reporting Information [Line Items]
Segment revenue	$ 2,363	$ 3,967	$ 812